1 files changed, 124 insertions, 0 deletions
diff --git a/src/tools/cargo/tests/testsuite/edition.rs b/src/tools/cargo/tests/testsuite/edition.rs
new file mode 100644
index 000000000..377a86ec0
--- /dev/null
+++ b/src/tools/cargo/tests/testsuite/edition.rs
@@ -0,0 +1,124 @@
+//! Tests for edition setting.
+
+use cargo::core::Edition;
+use cargo_test_support::{basic_lib_manifest, project};
+
+#[cargo_test]
+fn edition_works_for_build_script() {
+    let p = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = 'foo'
+                version = '0.1.0'
+                edition = '2018'
+
+                [build-dependencies]
+                a = { path = 'a' }
+            "#,
+        )
+        .file("src/lib.rs", "")
+        .file(
+            "build.rs",
+            r#"
+                fn main() {
+                    a::foo();
+                }
+            "#,
+        )
+        .file("a/Cargo.toml", &basic_lib_manifest("a"))
+        .file("a/src/lib.rs", "pub fn foo() {}")
+        .build();
+
+    p.cargo("check -v").run();
+}
+
+#[cargo_test]
+fn edition_unstable_gated() {
+    // During the period where a new edition is coming up, but not yet stable,
+    // this test will verify that it cannot be used on stable. If there is no
+    // next edition, it does nothing.
+    let next = match Edition::LATEST_UNSTABLE {
+        Some(next) => next,
+        None => {
+            eprintln!("Next edition is currently not available, skipping test.");
+            return;
+        }
+    };
+    let p = project()
+        .file(
+            "Cargo.toml",
+            &format!(
+                r#"
+                [package]
+                name = "foo"
+                version = "0.1.0"
+                edition = "{}"
+            "#,
+                next
+            ),
+        )
+        .file("src/lib.rs", "")
+        .build();
+
+    p.cargo("check")
+        .with_status(101)
+        .with_stderr(&format!(
+            "\
+[ERROR] failed to parse manifest at `[..]/foo/Cargo.toml`
+
+Caused by:
+  feature `edition{next}` is required
+
+  The package requires the Cargo feature called `edition{next}`, \
+  but that feature is not stabilized in this version of Cargo (1.[..]).
+  Consider trying a newer version of Cargo (this may require the nightly release).
+  See https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#edition-{next} \
+  for more information about the status of this feature.
+",
+            next = next
+        ))
+        .run();
+}
+
+#[cargo_test(nightly, reason = "fundamentally always nightly")]
+fn edition_unstable() {
+    // During the period where a new edition is coming up, but not yet stable,
+    // this test will verify that it can be used with `cargo-features`. If
+    // there is no next edition, it does nothing.
+    let next = match Edition::LATEST_UNSTABLE {
+        Some(next) => next,
+        None => {
+            eprintln!("Next edition is currently not available, skipping test.");
+            return;
+        }
+    };
+    let p = project()
+        .file(
+            "Cargo.toml",
+            &format!(
+                r#"
+                cargo-features = ["edition{next}"]
+
+                [package]
+                name = "foo"
+                version = "0.1.0"
+                edition = "{next}"
+            "#,
+                next = next
+            ),
+        )
+        .file("src/lib.rs", "")
+        .build();
+
+    p.cargo("check")
+        .masquerade_as_nightly_cargo(&["always_nightly"])
+        .with_stderr(
+            "\
+[CHECKING] foo [..]
+[FINISHED] [..]
+",
+        )
+        .run();
+}